The 39-year-old founder of Paytm, Vijay Shekhar Sharma, with a net worth of $1.7 billion, is the only Indian billionaire in the under-40 league.

Vijay Shekhar Sharma Founder and CEO of Paytm in his office at Noida. (File photo)

Paytm founder Vijay Shekhar Sharma, 39, is the youngest Indian billionaire, while 92-year-old Samprada Singh, chairman emeritus of Alkem Laboratories Ltd, is the oldest, according to Forbes magazine.

Sharma, ranked 1,394th on the list with a fortune of $1.7 billion, is the only Indian billionaire in the under-40 league. Sharma founded fast-rising mobile wallet Paytm in 2011. He has also created Paytm Mall, an e-commerce business business and Paytm Payments Bank.

“One of the biggest beneficiaries of India’s demonetisation, Paytm has notched up 250 million registered users and 7 million transactions daily. Sharma owns 16% of Paytm, which is now valued at $9.4 billion,” Forbes said.

Of the 2,208 billionaires in Forbes’ 2018 list of the world’s richest, just 63 are under the age of 40 and more than half (34) are self-made entrepreneurs. In all, the 63 youngest billionaires in the world are worth a collective $265 billion, up from $208 billion last year.

Meanwhile, 92-year-old Samprada Singh, who is the chairman emeritus of Alkem Laboratories, is the oldest Indian billionaire. He was ranked 1,867th on the list with a net worth of $1.2 billion. Singh founded the pharma firm Alkem Laboratories 45 years ago. Singh worked in a chemist’s store before venturing out on his own distributing pharmaceuticals.

“Shares of the generics maker, known for its antibiotics Clavam and Taxim, have more than doubled since its November 2016 IPO. For the year ended March 2017, Alkem reported a 20% rise in net earnings to $139 million on revenues of $913 million,” Forbes said.